A method for operating an electric motor when at a rotational speed below or above a predetermined limit value. The method involves operating an electric motor that has a stator and a rotor, wherein the stator or the rotor has at least three segments each having at least one electromagnetic element. The method includes simultaneously de-energizing all electromagnetic elements of all segments while the rotor rotates, measuring an electrical quantity induced in the electromagnetic elements, in particular an induced voltage, for each segment, and determining a rotor position of the rotor in relation to the stator from the measured electrical quantities. An electrical current can be supplied to the electromagnetic elements such that a segment magnetic field is formed to provide a segment torque to the rotor. The intensity of the electrical current depends on a segment position of the rotor in relation to the segment.

Method of starting a three-phase sinusoidal BLDC motor, comprising: a) determining an initial position of the rotor; b) applying a first set of sinusoidal energizing signals to the windings, corresponding to a set of sinusoidal waveforms shifted apart by 120 and 240 sampled at a first angle (1); and maintaining the energizing signals for allowing the rotor to move to a first angular position; c) while maintaining the energizing signals, monitoring two of the phase currents, and determining whether a predefined condition is satisfied, comprising testing whether a ratio of two total current values is equal to a predefined value, and if true, to repeat steps b) and c), but with second and further sinusoidal energizing signals sampled at a second or further angular position, selected from a limited group of discrete angular positions.

Disclosed are systems, methods, and devices for configuring the output provided by an inverter to an electric motor based on the position of the electric motor with respect to another electric motor.

Disclosed are systems, methods, and devices for configuring the output provided by an inverter to an electric motor based on the position of the electric motor with respect to another electric motor.

A slide-out or retractable room for a mobile living quarters, such as a recreational vehicle, is provided with actuating assemblies mounted on opposite side walls of the slide-out room and the adjacent wall of the main living area. The actuating assemblies include a pair of parallel gear racks mounted on the side wall, which are engaged by pinions rotated by torque shafts mounted on the main living quarters. Each torque shaft is rotated by a separate motor. A roller engages a bearing surface on the lower portion of the gear racks. Accordingly, the slide-out room is extended and retracted by rotating the torque shafts to cause the gear racks and the attached slide-out room to extend and retract. The weight of the slide-out room is supported by the rollers, thereby supporting the slide-out room off of the floor of the main living quarters as it extends and retracts. A synchronizing control operates the motors.

Systems and methods for driving a plurality of permanent magnet synchronous motors are provided. An embodiment of the system can include a first permanent magnet synchronous motor coupled to a first slip coupling, a second permanent magnet synchronous motor coupled to a second slip coupling, and the first permanent magnet synchronous motor and the second permanent magnet synchronous motor can be electrically connected in parallel on a bus.

A system includes one or more synchronous generators mechanically coupled to an excitation system. The excitation system is configured to output an excitation signal to excite the synchronous generator to produce a voltage and a current at an output of the synchronous generator. During startup of the synchronous generator, the excitation system may also output pulses of the excitation signal to initiate synchronism of one or more non-rotating electric motors electrically coupled to the synchronous generator. In addition, the pulses may be output to urge rotation of the non-rotating electric motors into rotational electrical alignment with the synchronous generator and each other.

An electric vehicle accomplishes speed changes through the use of electronically controlled, multiple electric motor configurations that are coupled to an output drive shaft instead of a speed change transmission. A parallel-coupled motor configuration includes at least two motors that are each coupled to the output drive shaft through respective gear arrangements, each gear arrangement having a respective gear ratio. In a serially-coupled motor configuration, the stator of the second motor is coupled to the rotor of the first motor, where the rotor of the second motor is coupled to the output drive shaft. The required torque to reach or maintain a desired vehicle speed can be obtained by selective energization of either one or both of the motors (in both multi-motor configurations). Two motors are also coupled to a differential gear so that the rotational speed contributed by both motors are additive at the output shaft.

A method of compensating for magnetic flux resulting from variance from a first electric machine to a second electric machine. A magnetic flux change for the first machine is calculated as a function of a flux difference between the first machine and the second machine. Operation of the first machine is controlled using the magnetic flux change.

An electric vehicle system featuring a novel idling capability is presented. The vehicle performs without electricity from an external power source resulting in decreased entropy generation. It also asserts a zero carbon footprint while excluding typical emissions produced by conventional all-electric vehicles. This novel invention has a capacity between idle speed (1000 rpm) and high speed (6000 rpm) using a constant electric current.